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dc.contributor.author
Flores, David Alfredo
dc.contributor.author
del Castillo, Daniela Laura
dc.contributor.author
Yamada, Tadasu
dc.date.available
2018-06-07T20:31:54Z
dc.date.issued
2017-01
dc.identifier.citation
Flores, David Alfredo; del Castillo, Daniela Laura; Yamada, Tadasu; Postnatal cranial growth of Risso’s dolphin (Grampus griseus); De Gruyter; Mammalia; 81; 6; 1-2017
dc.identifier.issn
0025-1461
dc.identifier.uri
http://hdl.handle.net/11336/47782
dc.description.abstract
The short-nosed Risso’s dolphin (Grampus griseus) is the fifth largest member of Delphinidae, but is one of the least studied dolphin species. We studied the postnatal ontogeny and sexual dimorphism of the skull of Risso’s dolphin by applying linear bivariate and multivariate analyses of allometry and discussing our findings in a comparative and functional framework. Comparing a representative of the Globicephalinae subfamily (a typically short-nosed group) with previously studied cetaceans belonging to different families is important for evaluating variations in the growth of splanchnocranium and neurocranium in cetaceans. Results of bivariate and multivariate approaches were mostly similar. The trophic apparatus showed positive allometry or isometry, whereas negative allometry was observed in neurochranial components and in width of external nares. We detected sexual dimorphism in the growth pattern of cranial variables related to trophic functions, suggesting slight differences in the mechanics of the trophic apparatus. Our results indicate a very low degree of sexual dimorphism in skull growth compared with other dolphins with most dimorphic growth rates favoring females; this result can be related to the earlier acquisition of an optimal performance in females, which is important for reproductive requirements. The growth of the splanchnocranium, and especially of those characters associated with the trophic function, exhibits a pattern of higher growth rate than neurochranial components, regardless of the short face of G. griseus.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
De Gruyter
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Allometry
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Grampus
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Ontogeny
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Skull
dc.subject.classification
Otras Ciencias Biológicas
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Ciencias Biológicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Postnatal cranial growth of Risso’s dolphin (Grampus griseus)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-05-30T15:14:37Z
dc.journal.volume
81
dc.journal.number
6
dc.journal.pais
Alemania
dc.journal.ciudad
Berlin
dc.description.fil
Fil: Flores, David Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo. San Miguel de Tucumán; Argentina
dc.description.fil
Fil: del Castillo, Daniela Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
dc.description.fil
Fil: Yamada, Tadasu. National Museum Of Nature And Science; Japón
dc.journal.title
Mammalia
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1515/mammalia-2016-0052
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.degruyter.com/view/j/mamm.2017.81.issue-6/mammalia-2016-0052/mammalia-2016-0052.xml
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